I can't stand for my cats to kill anything. I rescue lizards, little snakes, bugs.....and that's just what I see them with!!!! I can't have them in but they have never brought me anything here. They did on the ranch. It was shrew city there.....I don't like killing of any kind. I don't even kill snakes. I remove them.......even rattlesnakes if they aren't a threat........xoxoxo pat